2.11 Asynchronous Transmission

A communication process is called asynchronous if the communication devices do not need to coordinate before sending data. In practice this means, that the sender can wait an arbitrary time before sending data and the receiver must be ready at any time to accept the data. Asynchronous communication is useful for devices like computer keyboards which can be operated any time by the user. If a key of a keyboard is touched data flows from the keyboard to the computer. As soon as the key is released the data flow stops.

Asynchronus Transmission is shown in Animation 2.11-1.